SELECT order_date AS action_date, 
        ( SELECT name
            FROM person
            WHERE id = person_order.person_id
        ) AS person_name
FROM person_order
INTERSECT
SELECT visit_date AS action_date,
        ( SELECT name
            FROM person
            WHERE id = person_visits.person_id
        ) AS person_name
FROM person_visits
ORDER BY action_date, person_name DESC;